CN106093350A - The method determining heterogeneous carbonate reservoir saturation exponent - Google Patents
The method determining heterogeneous carbonate reservoir saturation exponent Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 211
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000011148 porous material Substances 0.000 claims description 24
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- 239000009096 changqing Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000008398 formation water Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
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- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 239000009671 shengli Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
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- G—PHYSICS
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- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
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- G—PHYSICS
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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Abstract
A kind of method determining heterogeneous carbonate reservoir saturation exponent of disclosure, including: according to pre-defined rule, target rock reservoir is divided at least two Reservoir type；Obtain the corresponding relation between saturation exponent and irreducible water saturation in every kind of Reservoir type；Reservoir type belonging to rock core to be measured is determined according to described pre-defined rule；Obtain the irreducible water saturation of described rock core to be measured；Irreducible water saturation according to described rock core to be measured described corresponding relation based on described affiliated Reservoir type calculates the saturation exponent of described rock core to be measured.
Description
Technical field
The present invention relates to oil-gas reservoir Logging Evaluation of Fractured Reservoir technical field, determine that heterogeneous carbonate stores up particularly to one
The method of layer saturation exponent.
Background technology
The electric conductivity of reservoir rock depends primarily on the fluid properties in interstitial space, saturation and spatial distribution thereof,
For heterogeneous carbonate reservoir, pore structure affects highly significant to resistivity, sometimes the seam hole shadow to resistivity
Ringing the impact of remote super oil-gas possibility, Many researchers attempts to break away from simple dependent resistor rate curve over more than 70 year and calculates saturation
Traditional method, attempts utilizing various non-electrical log to calculate carbonate rock saturation, but effect is unsatisfactory.Therefore, it is so far
Only, the saturation computation based on electrical log is still that the most practical, feasible method.
Archie (1942) proposes oil-bearing reservoir resistivity Magnification water saturation, formation factor hole the earliest
Relational expression between porosity.Li Ning (1989) is based on Inhomogeneous Anisotropic stratigraphic model, by complete mathematical derivation,
Give the relational expression between resistivity Magnification water saturation, formation factor porosity.Universal relation formula is from theory
On solve the accurate quantification computational problem of heterogeneous body complicated reservoirs saturation, but under prior art conditions, be applied
Also needing to solve two key technical problems in actual production: first, universal relation formula is a general solution equation, is not easy to straight
Connect for program calculation, i.e. under the conditions of existing logging technique, determine that all parameters in universal relation are extremely difficult, therefore real
Border application needs to select to meet according to actual reservoir characteristic the short-form (also referred to as optimised form) of required precision；Secondly,
Need to select a kind of method reliably accurately to determine each undetermined parameter in optimised form so that the computation model energy finally determined
True rule between reflection reservoir resistivity and water saturation the most to greatest extent.
During hydrocarbon saturation with Archie formula as core calculates, relate to cementation factor m, saturation exponent this
Two important litho-electric parameters.The most accurately determine saturation exponent, be petrophysicist and log analyst all the time
The emphasis of research.At present, determine that the method for saturation exponent substantially can be divided into two big classes: one is to utilize rock-electric test, logical
Relation between over-fitting resistance Magnification water saturation determines；Two is to utilize the saturation exponent and hole set up
Empirical relation between the reservoir parameters such as degree, permeability determines.First kind method belongs to direct method, is current saturation exponent
The conventional method determined, but there are two shortcomings in actual application: first, in order to determine saturation exponent, need every block of rock
The heart carries out change saturation rock-electric test (such as gas drive method), and the time that this experiment spends is the longest；Secondly, such method is utilized
It is difficult to be dynamically determined according to reservoir characteristics the numerical value of saturation exponent by well-log information.Equations of The Second Kind method belongs to indirect
Method, is the emphasis of research the most both at home and abroad, utilizes such method easily to realize being dynamically determined of saturation exponent.By research,
Many researchers it is also proposed and gives high porosity sandstone in SHENGLI PETROLEUM AREA according to reservoir physical parameter, such as Zhu Jiajun (2010)
Reservoir saturation exponent and porosity and the relation of formation water salinity, Fu Aibing (2007) passes through piecewise regression and dependency
Analyze and research the method for saturation exponent.These researchs have focused largely on sandstone reservoir, carbonate rock saturation exponent
It is dynamically determined technique study relatively fewer.Additionally, existing research is more based on saturation exponent and reservoir porosity, infiltration
Rate relation analysis, for heterogeneous body carbonate complex rock, research shows the change of saturation exponent under same holes porosity, permeability
Change scope is relatively big, the most accurately determines that the numerical value of carbonate rock saturation exponent is faced in current logging evaluation
Big challenge.
Summary of the invention
For above-mentioned technical problem, the present invention proposes a kind of side determining heterogeneous carbonate reservoir saturation exponent
Method, can accurately determine heterogeneous carbonate saturation exponent, thus it is dynamic to realize carbonate rock saturation model parameter
Determine, improve the computational accuracy of hydrocarbon saturation.
For reaching above-mentioned purpose, the application provides a kind of method determining heterogeneous carbonate reservoir saturation exponent,
Including:
According to pre-defined rule, target rock reservoir is divided at least two Reservoir type；
Obtain the corresponding relation between saturation exponent and irreducible water saturation in every kind of Reservoir type；
Reservoir type belonging to rock core to be measured is determined according to described pre-defined rule；
Obtain the irreducible water saturation of described rock core to be measured；
Irreducible water saturation according to described rock core to be measured described corresponding relation based on described affiliated Reservoir type calculates
The saturation exponent of described rock core to be measured.
As one preferred embodiment, described according to pre-defined rule, target rock reservoir is divided at least two reservoir class
Type includes:
Choose the rock core sample of polylith target rock reservoir；
Originally it is divided at least two class rock cores to represent at least two Reservoir type core sample described in polylith according to pre-defined rule.
As one preferred embodiment, the rock core sample of more than 10 pieces target rock reservoirs is chosen.
As one preferred embodiment, the rock core sample choosing polylith target rock reservoir described in includes:
Determine the position of target rock reservoir, effective thickness；
The position of coring of target rock reservoir is determined according to Image Logging Data；
Multiple rock core sample is drilled through in described position of coring.
As one preferred embodiment, described according to pre-defined rule, core sample described in polylith is originally divided at least two classes
Rock core includes to represent at least two Reservoir type:
According to pre-defined rule, core sample described in polylith is originally divided into two class rock cores；Described two class rock cores include: a class is hole
Hole is grown but the rock core sample of hole poor connectivity；Another kind of is containing crack or the rock core sample based on intracrystalline pore.
As one preferred embodiment, described pre-defined rule includes:
If it can be seen that Porous Characteristic but free from flaw feature in the Image Logging Data that rock core is corresponding, or oozing intersection in hole
In figure, the data point of this rock core is positioned at lower right, or during core observation naked eyes it can be seen that corrosion hole but deposit without microcrack
, then this rock core can be classified as hole grow but the rock core of hole poor connectivity, otherwise rock core can range containing crack or with
Intracrystalline pore is main rock core.
As one preferred embodiment, saturation exponent and irreducible water saturation in every kind of Reservoir type of described acquisition
Between corresponding relation include:
Obtain the irreducible water saturation of every piece of described rock core sample；
Obtain the saturation exponent of every piece of described rock core sample；
By the saturation exponent of rock core sample described in every kind of Reservoir type with irreducible water saturation linear fit to obtain
Saturation exponent and the corresponding relation of irreducible water saturation in every kind of Reservoir type；Described corresponding relation is as follows:
N=aSwir+b；
N is saturation exponent；Swir is irreducible water saturation.
As one preferred embodiment, saturation exponent and irreducible water saturation in every kind of Reservoir type of described acquisition
Between corresponding relation also include:
The described rock core sample of partial amt in every kind of Reservoir type is chosen according to described irreducible water saturation；
Corresponding, the saturation exponent of described acquisition every piece described rock core sample includes:
Obtain in every kind of Reservoir type the saturation of every piece of described rock core sample in the described rock core sample of partial amt to refer to
Number.
As one preferred embodiment, the irreducible water saturation of described acquisition every block described rock core sample includes:
Rock core sample every piece described is carried out hole and oozes parameter measurement and centrefuge experiment to determine irreducible water saturation.
As one preferred embodiment, the saturation exponent of described acquisition every block described rock core sample includes:
The described rock core sample of partial amt in every kind of Reservoir type is carried out rock-electric test to obtain saturation exponent.
As one preferred embodiment, the irreducible water saturation of the described rock core to be measured of described acquisition includes:
Described rock core to be measured is carried out hole and oozes parameter measurement and centrefuge experiment to determine irreducible water saturation.
By above description it can be seen that compared with the determination method of tradition reservoir saturation exponent, the present invention proposes
Method has following significant advantage: (1) determines that method is easy: once this area's saturation n and irreducible water saturation Swir
Between relation set up, utilize the method, be not required to again interval of interest rock core be carried out reservoir conditions rock-electric test, can by bundle
Tie up water saturation and determine the numerical value of other layer of reservoir saturation exponent in this area, thus it is multiple to overcome reservoir conditions rock-electric test
Miscellaneous difficulty；(2) parameter is the most accurate: utilize the method can determine the saturated of correspondence according to target zone position different reservoir feature
Degree index, embodies the different pore structures difference on electrically impact；(3) it is easy to utilize well-log information to be dynamically determined: utilizing should
Method, utilizes well-log information can conveniently realize the dynamic calculation of saturation exponent, thus improves carbonate complex rock oil
The computational accuracy of gas saturation.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those skilled in the art, on the premise of not paying creative work, it is also possible to root
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the method for the determination heterogeneous carbonate reservoir saturation exponent that a kind of embodiment of the application is provided
Flow chart of steps；
Fig. 2 is that Changqing oilfields hole is grown but the reservoir saturation exponent of hole poor connectivity and irreducible water saturation
Corresponding relation figure between Swir；
Fig. 3 is that Changqing oilfields contains crack or the reservoir saturation exponent based on intracrystalline pore and irreducible water saturation Swir
Between corresponding relation figure.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in the application, real below in conjunction with the application
Execute the accompanying drawing in example, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described enforcement
Example is only some embodiments of the present application rather than whole embodiments.Based on the embodiment in the application, this area is common
The every other embodiment that technical staff is obtained on the premise of not making creative work, all should belong to the present invention and protect
The scope protected.
As it is shown in figure 1, the application one embodiment provides one to determine heterogeneous carbonate reservoir saturation exponent
Method, the method comprises the following steps:
S100: target rock reservoir is divided at least two Reservoir type according to pre-defined rule；
This step is to consider the pore structure characteristic of heterogeneous carbonate reservoir, and target rock reservoir is divided at least two
Plant Reservoir type.There is difference in the pore structure of different reservoir type.
In one embodiment, described according to pre-defined rule, target rock reservoir is divided at least two Reservoir type (step
Rapid S100) include following sub-step:
S110, choose the rock core sample of polylith target rock reservoir；
Reflection Reservoir levels preferably, in this step, preferably chooses the core sample of more than 10 pieces target rock reservoirs
This.
This step S110 can be chosen survey region representational rock core sample, refer to conventional, imaging logging
On Information integration analysis foundation, determine the position of target zone position, effective thickness, and according to data such as routine, imaging loggings
Variation characteristic in the vertical, determines and cores position and drill through representational rock core sample.
Specifically, choose the rock core sample (step S110) of polylith target rock reservoir described in and can include following sub-step:
S111, determine the position of target rock reservoir, effective thickness；S112, determine coring of target rock reservoir according to Image Logging Data
Position；S113, drill through multiple rock core sample in described position of coring.
S120, originally it is divided at least two class rock cores to represent at least two reservoir core sample described in polylith according to pre-defined rule
Type；
In this step, represented the Porous Characteristic of its place reservoir by the Porous Characteristic of rock core sample, on this is also
The purpose of one many more than the 10 pieces rock core samples of step S110 choosing, represented place rock storage by core sample exactly originally with finer
The feature of layer.
It is also preferred that the left described, core sample described in polylith is originally divided at least two class rock cores to represent at least two according to pre-defined rule
Kind of Reservoir type (step S120) may include that S121, core sample described in polylith be originally divided into according to pre-defined rule two class rock cores；
Described two class rock cores include: a class is that hole is grown but the rock core sample (first kind) of hole poor connectivity；Another kind of is containing splitting
Seam or the rock core sample (Equations of The Second Kind) based on intracrystalline pore.
Wherein, if described pre-defined rule may include that in the Image Logging Data that rock core is corresponding it can be seen that Porous Characteristic
But free from flaw feature, or in cross plot (porosity-permeability cross plot) is oozed in hole, the data point of this rock core is positioned at lower right,
Or naked eyes during core observation it can be seen that corrosion hole but without microcrack exist, then this rock core can be classified as hole grow but hole
The rock core of hole poor connectivity, otherwise rock core can range containing crack or the rock core based on intracrystalline pore.
S200: obtain the corresponding relation between saturation exponent and irreducible water saturation in every kind of Reservoir type；
Wherein, this step S200 can be performed by following steps: S210, obtains the irreducible water of every piece of described rock core sample
Saturation；S220, obtain the saturation exponent of every piece of described rock core sample；S230, by core sample described in every kind of Reservoir type
This saturation exponent and irreducible water saturation linear fit are satisfied with irreducible water to obtain saturation exponent in every kind of Reservoir type
Corresponding relation with degree.Described corresponding relation is: n=aSwir+b；Wherein, n is saturation exponent；Swir is that irreducible water is saturated
Degree.
In step s 200, first to selected rock core sample, carry out porosity, Permeability Parameters measurement, the most right
Selected rock core is centrifuged experiment.In experiment, the selection of centrifugal force should be with reference to the hole of reservoir and pressure characteristic.Centrifugal real
In testing, should first measure the full wet weight of rock core sample, under certain rotating speed (centrifugal force in other words), then be centrifuged experiment,
Experiment measures the rock core sample weight after being centrifuged after terminating, and calculates the irreducible water saturation of rock core.That is, described every piece of institute of acquisition
The irreducible water saturation (step S210) stating rock core sample may include that rock core sample every piece described is carried out hole oozes parameter measurement
And centrefuge experiment is to determine irreducible water saturation.
In experiment, type and the salinity of formation water determine according to survey region formation water analysis of data, experimental temperature and
Confined pressure determines according to reservoir temperature and the pressure of interval of interest.On the basis of (displacement) rock-electric test, draw the electricity of rock core sample
Graph of a relation between resistance Magnification and water saturation, and utilize Archie formula (Archie formula) to determine that every block of rock core is saturated
The numerical value of degree index n.That is, the saturation exponent (S220) of described every piece of described rock core sample of acquisition may include that every kind of storage
In layer type, the described rock core sample of partial amt carries out rock-electric test to obtain saturation exponent.
Further, for obtaining rationally result of calculation the most accurately, in every kind of Reservoir type of described acquisition saturation exponent with
Corresponding relation (step S200) between irreducible water saturation can also include step: S225, according to described irreducible water saturation
Choose the described rock core sample of partial amt in every kind of Reservoir type.
Corresponding, saturation exponent step S230 of described acquisition every piece described rock core sample then include (being): S231,
Obtain in every kind of Reservoir type the saturation exponent of every piece of described rock core sample in the described rock core sample of partial amt.
Irrational data can be rejected, i.e. irreducible water saturation does not substantially meet this rock core sample by step S225
Place Reservoir levels, thus improve the precision of calculating.Research shows, first kind rock core irreducible water saturation is the most relatively low, second
The irreducible water saturation of class rock core is the highest.In each class rock core, select there is representative according to the numerical value of irreducible water saturation
The rock core of property carries out rock-electric test.Such as: if survey region, first kind rock core irreducible water saturation is 50% to the maximum, then need to be
First kind rock core select irreducible water saturation carry out rock-electric test at the representative rock core of 0-50%, the number more than 50%
According to rejecting.After rejecting irrational rock core sample, every piece of remaining rock core sample is all carried out rock-electric test (i.e. step
S231)。
In step S230, according to selected irreducible water saturation Swir of representative rock core, saturation exponent
Result of calculation, determined between this area's different reservoir type saturation exponent and irreducible water saturation Swir by matching
Relation, as a example by above-mentioned two class Reservoir types:
1st class: hole is grown but the saturation exponent of the reservoir of hole poor connectivity pass corresponding with irreducible water saturation
System is:
N=a1Swir+b1 (1)
2nd class: the saturation exponent containing crack or the reservoir based on intracrystalline pore and the corresponding relation of irreducible water saturation
For
N=a2Swir+b2 (2)
Parameter a in above-mentioned formula1、b1And a2、b2It is constant for the certain layer position of particular locality, but different regions,
The numerical value of different layers position above-mentioned parameter there are differences, parameter a1、b1And a2、b2Numerical value can be determined by core experiment.
S300: determine Reservoir type belonging to rock core to be measured according to described pre-defined rule；
In this step, S300 can confirm Reservoir type belonging to rock core to be measured, rock core to be measured by above-mentioned pre-defined rule
Do not carry out rock-electric test.
Wherein, if described pre-defined rule may include that in the Image Logging Data that rock core is corresponding it can be seen that Porous Characteristic
But free from flaw feature, or the data point of this rock core is positioned at lower right, or naked eyes energy during core observation in cross plot is oozed in hole
Enough see corrosion hole but exist without microcrack, then this rock core can be classified as hole growth but the rock core of hole poor connectivity, no
Then rock core can range containing crack or the rock core based on intracrystalline pore.
S400: obtain the irreducible water saturation of described rock core to be measured；
In this step, rock core to be measured carrying out porosity, Permeability Parameters measurement, rock core the most to be measured is centrifuged reality
Test.In experiment, the selection of centrifugal force should be with reference to the hole of reservoir and pressure characteristic.In centrefuge experiment, should first measure rock core to be measured
Full wet weight, is then centrifuged experiment under certain rotating speed (centrifugal force in other words), and experiment is measured after terminating after being centrifuged
Rock core weight to be measured, and calculate the irreducible water saturation of rock core to be measured.
S500: according to the irreducible water saturation of described rock core to be measured described corresponding relation based on described affiliated Reservoir type
Calculate the saturation exponent of described rock core to be measured.
Such as, determine that Reservoir type belonging to rock core to be measured is the 1st class by step S300, determine that it is restrainted by step S400
Tiing up water saturation is SwirTreat, it is Swir in step S500TreatThat brings in step S230 in the 1st class Reservoir type is saturated
Degree index and the corresponding relation of irreducible water saturation, thus obtain the saturation exponent of rock core to be measuredTreat=a1SwirTreat+b1。
By above description it can be seen that compared with the determination method of tradition reservoir saturation exponent, the present invention proposes
Method has following significant advantage: (1) determines that method is easy: once this area's saturation n and irreducible water saturation Swir
Between relation set up, utilize the method, be not required to again interval of interest rock core be carried out reservoir conditions rock-electric test, can by bundle
Tie up water saturation and determine the numerical value of other layer of reservoir saturation exponent in this area, thus it is multiple to overcome reservoir conditions rock-electric test
Miscellaneous difficulty；(2) parameter is the most accurate: utilize the method can determine the saturated of correspondence according to target zone position different reservoir feature
Degree index, embodies the different pore structures difference on electrically impact；(3) it is easy to utilize well-log information to be dynamically determined: utilizing should
Method, utilizes well-log information can conveniently realize the dynamic calculation of saturation exponent, thus improves carbonate complex rock oil
The computational accuracy of gas saturation.
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is described in further detail.
On to Information integration analysis foundations such as Changqing oilfields interval routine, imaging loggings, it is determined that target zone position
Position, effective thickness, and according to data variation characteristics in the vertical such as routine, imaging loggings, determine the position boring of coring
Take 19 pieces of representational plunger rock core (this is rock core sample).
First to 19 blocks of selected plunger rock cores, porosity, Permeability Parameters measurement are carried out, then to selected rock
The heart is centrifuged experiment.In centrefuge experiment, first measure every block of rock core and satisfy wet weight, then under rotating speed is 3000 revolutions per seconds
Being centrifuged experiment, the weight after every block of rock core is centrifuged is measured in experiment after terminating.
Image Logging Data, properties of pore and permeability and core observation according to the selected rock core correspondence degree of depth is by above-mentioned 19 blocks of rock cores
Being divided into two classes that pore structure is different: a class is that hole is grown but the rock core of hole poor connectivity, totally 10 pieces, another kind of is containing splitting
Seam or the rock core based on intracrystalline pore, totally 9 pieces.Carry out classifying according to rock core pore structure method particularly includes: if rock core is corresponding
Image Logging Data on it can be seen that Porous Characteristic but free from flaw feature, or the data point of this rock core in cross plot is oozed in hole
Be positioned at lower right, or during core observation naked eyes it can be seen that corrosion hole but exist without microcrack, then this rock core can be classified as
Hole is grown but the rock core of hole poor connectivity, and otherwise rock core can range Equations of The Second Kind, i.e. containing crack or based on intracrystalline pore
Rock core.If rock core has carried out three dimensional CT test, then according to CT data, rock core is divided into hole and grows but hole poor connectivity
Rock core, containing crack or the rock core based on intracrystalline pore, the easiest, accurately.
Rock core to above-mentioned two class different pore structures, selects representative rock core to carry out according to irreducible water saturation
Reservoir conditions displacement rock-electric test, and calculate the saturation exponent of rock core.According to irreducible water saturation, select Changqing oilfields
The layer position first kind (i.e. hole is grown but hole poor connectivity) 7 pieces of rock core, Equations of The Second Kind (i.e. containing crack or based on intracrystalline pore) rock
5 pieces of the heart has carried out reservoir conditions semi-permeable plate gas drive rock-electric test.In experiment, the salinity of saturated brine be 100000ppm,
Water type is NaCl type, and formation water resistivity Rw is 0.032 ohm meter.According to purpose region depth of reservoirs, in experiment, confined pressure is
15MPa。
According to the resistivity of rock core under the different water cut saturation obtained in experiment, depict every piece of rock core resistance Magnification
And the graph of a relation between water saturation, and Archie formula is utilized to determine the numerical value of every piece of rock core saturation exponent.
According to selected irreducible water saturation Swir of representative rock core, the result of calculation of saturation exponent, logical
Over-fitting determines the relation between this area's different reservoir type saturation exponent and irreducible water saturation Swir:
Changqing oilfields layer position first kind reservoir, i.e. hole are grown but the reservoir irreducible water saturation of hole poor connectivity
Graph of a relation between Swir and saturation exponent is shown in accompanying drawing 2, and quantitative fit correlation formula is:
N=2.342Swir+0.857 (1)
Changqing oilfields layer position Equations of The Second Kind reservoir, i.e. containing crack or reservoir irreducible water saturation Swir based on intracrystalline pore
And the graph of a relation between saturation exponent is shown in accompanying drawing 3, quantitative fit correlation formula is:
N=-1.957Swir+2.919 (2)
Changqing oilfields interval is not carried out store up rock-electric test rock core A, B (this is rock core to be measured), first analyze this two
The pore structure type of block rock core, according to the above analysis method (pre-defined rule), determine that rock core A is the first kind, and rock core B is second
Class, irreducible water saturation Swir calculating this rock core A according to centrifuge results is 0.38, and irreducible water saturation Swir of rock core B is
0.71, utilize the relation between aforementioned two class reservoir core irreducible water saturations Swir and the saturation exponent having built up, can
With the quick saturation exponent of rock core A that is calculated preparatively for 1.75, the saturation exponent of rock core B is 1.53.Similarly, may be used
In order to determining other rock core and the saturation exponent of corresponding interval reservoir in aforementioned manners.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become
Change and improvement both falls within the scope of protection of present invention.Claimed scope by appending claims and
Equivalent defines.
Claims (11)
1. the method determining heterogeneous carbonate reservoir saturation exponent, it is characterised in that including:
According to pre-defined rule, target rock reservoir is divided at least two Reservoir type；
Obtain the corresponding relation between saturation exponent and irreducible water saturation in every kind of Reservoir type；
Reservoir type belonging to rock core to be measured is determined according to described pre-defined rule；
Obtain the irreducible water saturation of described rock core to be measured；
Irreducible water saturation according to described rock core to be measured described corresponding relation based on described affiliated Reservoir type calculates described
The saturation exponent of rock core to be measured.
2. the method for claim 1, it is characterised in that described according to pre-defined rule, target rock reservoir is divided at least two
Plant Reservoir type to include:
Choose the rock core sample of polylith target rock reservoir；
Originally it is divided at least two class rock cores to represent at least two Reservoir type core sample described in polylith according to pre-defined rule.
3. method as claimed in claim 2, it is characterised in that choose the rock core sample of more than 10 pieces target rock reservoirs.
4. method as claimed in claim 2, it is characterised in that described in choose the rock core sample of polylith target rock reservoir and include:
Determine the position of target rock reservoir, effective thickness；
The position of coring of target rock reservoir is determined according to Image Logging Data；
Multiple rock core sample is drilled through in described position of coring.
5. method as claimed in claim 2, it is characterised in that described according to pre-defined rule, core sample described in polylith is originally divided into
At least two class rock cores include to represent at least two Reservoir type:
According to pre-defined rule, core sample described in polylith is originally divided into two class rock cores；Described two class rock cores include: a class is that hole is sent out
Educate but the rock core sample of hole poor connectivity；Another kind of is containing crack or the rock core sample based on intracrystalline pore.
6. method as claimed in claim 5, it is characterised in that described pre-defined rule includes:
If it can be seen that Porous Characteristic but free from flaw feature in the Image Logging Data that rock core is corresponding, or in cross plot is oozed in hole
The data point of this rock core is positioned at lower right, or during core observation naked eyes it can be seen that corrosion hole but exist without microcrack, then
This rock core can be classified as hole and grow but the rock core of hole poor connectivity, and otherwise rock core can range containing crack or with intracrystalline pore
It it is main rock core.
7. the method for claim 1, it is characterised in that saturation exponent and constraint in every kind of Reservoir type of described acquisition
Corresponding relation between water saturation includes:
Obtain the irreducible water saturation of every piece of described rock core sample；
Obtain the saturation exponent of every piece of described rock core sample；
By the saturation exponent of rock core sample described in every kind of Reservoir type with irreducible water saturation linear fit to obtain every kind
Saturation exponent and the corresponding relation of irreducible water saturation in Reservoir type；Described corresponding relation is as follows:
N=aSwir+b；
N is saturation exponent；Swir is irreducible water saturation.
8. method as claimed in claim 7, it is characterised in that saturation exponent and constraint in every kind of Reservoir type of described acquisition
Corresponding relation between water saturation also includes:
The described rock core sample of partial amt in every kind of Reservoir type is chosen according to described irreducible water saturation；
Corresponding, the saturation exponent of described acquisition every piece described rock core sample includes:
Obtain in every kind of Reservoir type the saturation exponent of every piece of described rock core sample in the described rock core sample of partial amt.
9. method as claimed in claim 7, it is characterised in that the irreducible water saturation of described acquisition every piece described rock core sample
Including:
Rock core sample every piece described is carried out hole and oozes parameter measurement and centrefuge experiment to determine irreducible water saturation.
10. method as claimed in claim 7, it is characterised in that the saturation exponent of described acquisition every piece described rock core sample
Including:
The described rock core sample of partial amt in every kind of Reservoir type is carried out rock-electric test to obtain saturation exponent.
11. the method for claim 1, it is characterised in that the irreducible water saturation bag of the described rock core to be measured of described acquisition
Include:
Described rock core to be measured is carried out hole and oozes parameter measurement and centrefuge experiment to determine irreducible water saturation.
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| US11112527B2 (en) | 2021-09-07 |
| CN106093350B (en) | 2018-05-04 |
| WO2018028258A1 (en) | 2018-02-15 |
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